Merge remote-tracking branch 'remotes/juanquintela/tags/migration/20180525' into...

Merge remote-tracking branch 'remotes/juanquintela/tags/migration/20180525' into staging

migration/next for 20180525

# gpg: Signature made Fri 25 May 2018 14:30:47 BST
# gpg:                using RSA key F487EF185872D723
# gpg: Good signature from "Juan Quintela <quintela@redhat.com>"
# gpg:                 aka "Juan Quintela <quintela@trasno.org>"
# Primary key fingerprint: 1899 FF8E DEBF 58CC EE03  4B82 F487 EF18 5872 D723

* remotes/juanquintela/tags/migration/20180525:
  migration: use g_free for ram load bitmap
  migration: fix exec/fd migrations

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>